The Haggis core

The complete Haggis distribution is relatively large and offers a multitude of abstractions or kits for creating user interface components and applications. Fortunately, the basic principles on which they all are built is quite small, and this section we present these core functionalities:

• Fundamental Haggis type: The component type.
• Basic combinators: Plugging components together.
• Display contexts: Creating a component in context.
• Realising the interface: Hooking a component up into a window.
• Fundamental leaf components: Basic components to get you started.

Core reference:

• Representing interactive components: The concrete representation of Haggis components.
• Event type: Representing user input events.
• System commands: The WComm type.
• Child requests: Calling on the parent.